adventitious

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adventitious

 [ad″ven-tish´us]
not normal to a part.

ad·ven·ti·tious

(ad-ven-tish'ŭs),
1. Arising from an external source or occurring in an unusual place or manner.
See also: extrinsic.
2. Occurring accidentally or spontaneously, as opposed to naturally or through heredity.
3. Synonym(s): adventitial

adventitious

(ăd′vĕn-tĭsh′əs, -vən-)
adj.
1. Arising from an external cause or factor; not inherent: "These rodents ... appear suddenly in the Oligocene, as if by adventitious entrance independent of the rest of the fauna" (George Gaylord Simpson).
2. Biology Of or belonging to a structure that develops in an unusual place: adventitious roots.

ad′ven·ti′tious·ly adv.
ad′ven·ti′tious·ness n.

ad·ven·ti·tious

(ad'vĕn-tish'ŭs)
1. Arising from an external source or occurring in an unusual place or manner.
See also: extrinsic
2. Occurring accidentally or spontaneously, as opposed to natural causes or hereditary.
3. Synonym(s): adventitial.

adventitious

1. Accidentally acquired or added by chance.
2. Occurring in an unusual place or in an irregular manner.

adventitious

  1. (of a root) growing laterally from a stem rather than the main root, e.g. prop roots of maize, clinging roots of climbing vines, and roots of BULBS, such as the daffodil.
  2. (of a bud) not developing in a leaf axil, as in Begonia where such buds can be produced from leaf wounds.

ad·ven·ti·tious

(ad'vĕn-tish'ŭs)
1. Arising from an external source or occurring in an unusual place or manner.
2. Occurring accidentally or spontaneously, as opposed to naturally or through heredity.
3. Synonym(s): adventitial.
References in periodicals archive ?
In vitro induction and regeneration of adventitious buds in sour orange epicotyl and internodal segments using two cytokine types (6-benzilaminopurine or kinetin) associated with naphthalene acetic acid.
In vitro induction and regeneration of adventitious buds and in vitro plant regeneration from different sour orange explants
For the induction and development of the adventitious buds, the explants were cultivated in MT medium supplemented with 1.0 mg [dm.sup.-3] BAP.
Adventitious buds were observed in some explants as early as 15 d after cultivation.
As previously observed in the first experiment, adventitious buds were formed as early as 15 d after cultivation, still under dark conditions.
Other research works have shown the importance of BAP supplementation in the culture media, as this cytokinin assures a greater number of adventitious buds in in vitro cultivated citrus explants (Moreira-Dias et al., 2001; Almeida et al., 2002; Silva et al., 2005a, 2005b; Schinor et al., 2006).
On 0.5 mg [L.sup.-1] TDZ supplemented medium, a mass of green compact calluses was formed after two weeks and adventitious buds appeared from both the calluses and leaf surface.
When the leaf explants of the first generation in vitro shoots from the same medium were cultured on the shoot proliferation media for a total of 4 weeks, the numbers of adventitious buds formation had significantly different responses to different concentrations of BA or TDZ, with or without the combination of NAA (Table 2).
Clumps of adventitious buds from the proliferation media were separated and transferred to the same media for further development of shoots.